[lldb] Identify a WebAssembly module by its build id (#213554)

A Wasm module carries the identifier its linker gave it in a `build_id`
custom section, whose payload is the length of the identifier followed
by its bytes. That identifier is the only thing that tells one build of
a module from another.

`wasm-ld` emits the section only when asked, so the API test build asks
for it. A module linked without one still has no UUID.

GitOrigin-RevId: 0f068e7ba2ddfeaf078f87d53a33c6d662d4ce10